I have two Jets. One is CO2 drive plus wind, and the other is the later wind only when they found the CO2 to be impractical. Kowa made them for Graflex. The focusing is weird; the lens does not move but the film plane is shifted to change the distance to the lens. They have push button focusing like the Graphic 35. I have not put film in them. They are fun and interesting. While both of mine work, from what I have read they are reportedly fragile, so I treat them kindly.